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Electrochemical Cells, Galvanic Cells

Which of the ...

Question

Which of the following is incorrect in a galvanic cell?

A

Oxidation occurs at anode

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B

Reduction occurs at cathode

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C

The electrode at which electrons are gained is called cathode

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D

The electrode at which electrons are lost is called cathode.

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Solution

The correct option is C The electrode at which electrons are gained is called cathode
A galvanic cell is an electrochemical cell in which oxidation occurs at anode containing negative charge and reduction occurs at cathode containing a positive charge. At the anode, electrons are gained by an electrode and at the cathode, electrons are lost by an electrode.

Hence, the correct option is $C$

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Similar questions

Q. In an electrolytic cell, the electrode at which the electrons enter the solution is called the ________. The chemical change that occurs at this electrode is called as _________.

Q. Assertion :Anode is the electrode at which oxidation occurs and cathode is the electrode at which reduction occurs. Reason: Anode and cathode in electrochemical cells and electrolytic cells have opposite polarity.

Q. State whether the following statements are True of False:
In galvanic (voltaic) cell, the positive electrode is called cathode and the negative electrode is called anode.

Electrochemical Battery

An electrochemical battery is a device powered by oxidation and reduction reactions that are physically separated. So that the electrons must travel through a wire from the reducing agent to the oxidizing agent.

The reducing agent loses electrons and is oxidized in a reaction that takes place at an electrode is called the anode. The oxidizing agent gains electrons and is reduced in a reaction that takes at an electrode is called the cathode.

To maintain a net zero charge in each compartment, there is a limited flow of ions through a salt bridge.

For example, in a car battery the reducing agent is oxidized by the following reaction, which involves a lead (

P b

) anode and sulfuric acid (

H_{2} S O_{4}

). Lead sulfate (

P b S O_{4}

H

), and electrons (

e^{-}

) are produced.

At the cathode, the below reaction occurs :

P b O_{2} + H_{2} S O_{4} + 2 H^{+} + 2 e^{-} \to

At the anode, the below reaction occurs :

P b + H_{2} S O_{4} \to P b S O_{4} + 2 H^{+} + 2 e^{-}

Electrons are produced by a chemical reaction that takes place at the:

Q. Assertion :In an electrochemical cell, the electrode that is the site of reduction is called the anode.
Reason: Oxidation always occurs at the cathode.

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